An effective, albeit somewhat artificial, exercise in suspense, The Wall derives much of its propulsion from Aaron Taylor-Johnson’s grunting, grimacing performance as a wounded US soldier squaring off with an unseen Iraqi sniper.

While one can admire the commitment, technique, concentration and stamina required to keep the pressure cooker at maximum temperature, it still feels like an exercise, one so dramatically monotonous and tonally high-pitched that you want to escape almost as much as the characters do.